pdfcraft

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mtlcl410andClaude Opus 5.5 390b2012e4 M1: a document that encrypts only its embedded files opens without a password

A crypt filter whose /AuthEvent is /EFOpen needs its password only when
an embedded file is accessed (ISO 32000-2 7.6.6, Table 25). A document
whose strings and streams are in the clear (/StmF, /StrF /Identity) and
whose encrypting filters are all EFOpen ones, /EFF naming one, now opens
without a password in cos and in the renderer (hayro-syntax patch 36).

Without the password there is no file key: the embedded files' data is
held and saved as stored, and Document::embedded_files_locked and
reads_as_stored say so. Asking for such an attachment's bytes is an
error. A full save that would renumber data whose key mixes in the
object number (RC4, AES-128), or change the document's security, is
refused. The password still opens the document and its attachments.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Pq7HyDBXygTf7jcqdsjcfn

2026-11-05 22:49:48 +08:00

bounded_writer.rs

Build each crate's integration tests as one binary (#4087 )

2026-10-22 11:28:58 -04:00

corpus.rs

Build each crate's integration tests as one binary (#4087 )

2026-10-22 11:28:58 -04:00

efopen.rs

M1: a document that encrypts only its embedded files opens without a password

2026-11-05 22:49:48 +08:00

encryption.rs

M1: encryption reads every legal form: crypt filters by reference, a stream's own filter on screen, and full saves that keep /Encrypt (#5548 )